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You can add a field in the State form created by the locations plugin to hold the shipping price. Then, add another data from entries field set to "just show it" and "hide this field unless the value of [state field] is equal to anything". Also add a hidden field for the total to send to PayPal.

From this point it will need a little custom javascript in the customizable HTML or php on the validation (frm_validate_entry) hook to calculate the total for that hidden field. It might actually be easier in the PHP. It looks like a few changes will be needed in the core plugin too.

First, install the latest RC version.

Then, open formidable/js/formidable.js and change line 82ish from:

data:"controller=fields&action=ajax_get_data&entry_id="+selected+"&field_id="+field_data[1],

to:

data:"controller=fields&action=ajax_get_data&entry_id="+selected+"&field_id="+field_data[1]+"&current_field="+field_data[0],

Then open formidable/pro/classes/controllers/FrmProFieldsController.php and change line 295ish from:

echo '<input type="hidden" value="'. stripslashes(esc_html($meta_value)) .'</p>';

to:

echo '<input type="hidden" name="item_meta['. $_POST['current_field'] .']" value="'. stripslashes(esc_html($meta_value)) .'"/>';

(These changes will be included in the next version) Now you will have access to the shipping value. The next step is adding it to your total. Are you good with javascript or PHP to do this on your own or do you need a little more guidance?

In most cases I'd send you to this post to do the calculation in javascript:

http://formidablepro.com/field…..culations/

However, since you are using a "Just show it" field, I think it would be easier to do this in the PHP. Something like this in a new plugin or your theme functions.php will set the value of the hidden field before the entry is saved.

add_filter('frm_validate_entry', 'frm_set_total', 10, 2);
function frm_set_total($errors, $values){
if($values['form_id'] == 5){ //replace 5 with the ID of your form
  $_POST['item_meta'][25] = $_POST['item_meta'][26] + $_POST['item_meta'][27]; 
  //change 25 to the ID of the hidden field, 26 and 27 to the IDs of the amount and shipping fields
}
return $errors;
}